Variations of eddy kinetic energy in the South China Sea

2010 ◽  
Vol 66 (1) ◽  
pp. 85-94 ◽  
Author(s):  
Xuhua Cheng ◽  
Yiquan Qi
Keyword(s):  
Kinetic Energy ◽  
South China Sea ◽  
South China ◽  
Eddy Kinetic Energy ◽  
The South China Sea ◽  
The South ◽  
China Sea

Seasonal variation of eddy kinetic energy in the South China Sea

2012 ◽  
Vol 31 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Hui Wang ◽  
Dakui Wang ◽  
Guimei Liu ◽  
Huiding Wu ◽  
Ming Li
Keyword(s):  
Seasonal Variation ◽  
Kinetic Energy ◽  
South China Sea ◽  
South China ◽  
Eddy Kinetic Energy ◽  
The South China Sea ◽  
The South ◽  
China Sea

scholarly journals Eddy-induced Heat Transport in the South China Sea

2021 ◽  
Author(s):  
Ruibin Ding ◽  
Jiliang Xuan ◽  
Tao Zhang ◽  
Lei Zhou ◽  
Feng Zhou ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
South China Sea ◽  
Heat Transport ◽  
South China ◽  
Eddy Kinetic Energy ◽  
The South China Sea ◽  
Kuroshio Intrusion ◽  
The South ◽  
China Sea ◽  
The Kuroshio

AbstractEddy-induced heat transport (EHT) in the South China Sea (SCS) is important for the heat budget. However, knowledge of its variability is limited owing to discrepancies arising from the limitation of the down-gradient method and uncertainties arising from numerical models. Herein, we investigated the spatiotemporal variability and dynamics of EHT using a well-validated assimilated model. In particular, to the southeast of Vietnam (SEV) and west of Luzon Strait (WLS), significant values of annual mean EHT are observed and most EHT is confined in the upper 400 m. EHT also exhibits significant seasonality, and the largest EHT amplitude in autumn at SEV is mainly driven by the wind stress curl, while that in winter at WLS is mainly related to the Kuroshio intrusion. Energy budget analysis reveals that both the barotropic and baroclinic instabilities increase the eddy kinetic energy in autumn at SEV, whereas only the barotropic instability contributes to the eddy kinetic energy at WLS in winter. Specially, an up-gradient EHT is observed at WLS in all four seasons, characterized by the same directions between EHT and mean temperature gradient. The up-gradient EHT at WLS is induced by the baroclinic instability through an inverse energy transfer, which is generated by the interaction between the Kuroshio intrusion and topography below the surface layer. Moreover, the most significant up-gradient EHT in winter shows a wave-like southwestward propagating pattern in the subsurface layer.

scholarly journals Observations of Shoaling Internal Wave Transformation Over a Gentle Slope in the South China Sea

2021 ◽  
Author(s):  
Steven R. Ramp ◽  
Yiing Jang Yang ◽  
Ching-Sang Chiu ◽  
D. Benjamin Reeder ◽  
Frederick L. Bahr
Keyword(s):  
Kinetic Energy ◽  
South China Sea ◽  
Energy Flux ◽  
South China ◽  
The South China Sea ◽  
Wave Transformation ◽  
Recent Theory ◽  
The South ◽  
China Sea ◽  
The Waves

Abstract. Four oceanographic moorings were deployed across the South China Sea continental slope near 21.85° N, 117.71° E, from May 30 to July 18, 2014 for the purpose of observing high-frequency nonlinear internal waves (NLIWs) as they shoaled across a rough, gently sloping bottom. Individual waves required just two hours to traverse the array and could thus easily be tracked from mooring-to-mooring. In general, the amplitude of the incoming NLIWs was a good match with the fortnightly tidal envelope in the Luzon Strait, lagged by 48.5 hours, and were smaller than the waves observed 50 km to the southwest near the Dongsha Plateau. The now-familiar type a-waves and b-waves were observed, with the b-waves always leading the a-waves by 6–8 hours. Most of the waves were remotely generated, but a few of the b-waves formed locally via convergence and breaking at the leading edge of the upslope internal tide. Waves incident upon the array with amplitude less than 50 m and energy less than 100 MJ m−1 propagated adiabatically upslope with little change of form. Larger waves formed packets via wave dispersion. For the larger waves, the kinetic energy flux decreased sharply upslope between 342 m to 266 m while the potential energy flux increased slightly, causing an increasing ratio of potential-to-kinetic energy as the waves shoaled. The results are in rough agreement with recent theory and numerical simulations of shoaling waves.

scholarly journals Kinetic Energy Budget during the Genesis Period of Tropical Cyclone Durian (2001) in the South China Sea

2016 ◽  
Vol 144 (8) ◽  
pp. 2831-2854 ◽  
Author(s):  
Yaping Wang ◽  
Xiaopeng Cui ◽  
Xiaofan Li ◽  
Wenlong Zhang ◽  
Yongjie Huang
Keyword(s):  
Tropical Cyclone ◽  
Kinetic Energy ◽  
South China Sea ◽  
Latent Heat ◽  
Energy Budget ◽  
South China ◽  
The South China Sea ◽  
The South ◽  
China Sea ◽  
Stage Stage

Abstract A set of kinetic energy (KE) budget equations associated with four horizontal flow components was derived to study the KE characteristics during the genesis of Tropical Cyclone (TC) Durian (2001) in the South China Sea using numerical simulation data. The genesis process was divided into three stages: the monsoon trough stage (stage 1), the midlevel mesoscale convective vortex (MCV) stage (stage 2), and the establishment stage of the TC vortex (stage 3). Analysis showed that the KE of the symmetric rotational flow (SRF) was the largest and kept increasing, especially in stages 2 and 3, representing the symmetrization process during TC genesis. The KE of the SRF was mainly converted from the KE of the symmetric divergent flow (SDF), largely transformed from the available potential energy (APE). It was found that vortical hot towers (VHTs) emerged abundantly, aggregated, and merged within the MCV region in stages 1 and 2. From the energy budget perspective, massive moist-convection-produced latent heat was concentrated and accumulated within the MCV region, especially in stage 2, and further warmed the atmosphere, benefiting the accumulation of APE and the transformation from APE to KE. As a result, the midlevel circulation (or MCV) grew strong rapidly. In stage 3, the intensity and number of VHTs both decreased. However, affected by increasing lower-level inward radial wind, latent heat released by the organized convection, instead of disorganized VHTs in the first two stages, continuously contributed to the strengthening of the surface TC circulation as well as the warm core.

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